Pistorius says Steenkamp's death was an accident and that he mistook her for a burglar.
Both men deny the murder charges and say they mistook the fishermen for pirates.
An attempt to make a ransom drop failed when the kidnappers mistook scoop-hungry reporters for cops.
The marines, who were guarding an Italian commercial vessel, mistook the fishermen for pirates, prosecutors allege.
Pistorius and his lawyers argue he mistook her for an intruder and killed her accidentally.
"Fifa mistook this for a caretaker committee which is not the case, " he explained.
She and Craig looked so much alike (and still do) that people often mistook them for twins.
On Johnson's 65-hectare farm in Virginia's hunt country, a neighbor once mistook him for a stable hand.
Mr Pistorius says he mistook her for a burglar when he shot her dead on 14 February.
They say the snipers probably mistook him for an Islamist fighter because of his beard and black robes.
They at times mistook the Merc for the Merchandise Mart, a 4-million-square-foot retail emporium on the Chicago River.
So when I watched the trailer of Beyond: Two Souls earlier, I mistook much of it for cutscenes.
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Authorities gave a different account, saying the pilot mistook the road for a runway due to bad weather.
Italy says the marines mistook the fishermen for pirates and fired warning shots.
What many mistook for rudderless dithering has since proven to be adroit maneuvering.
Mr. Nel, the state prosecutor, said he disputes Mr. Pistorius's account that he mistook Ms. Steenkamp for a thief.
WSJ: Pistorius Thought He Shot at Burglar in Bathroom, His Lawyer Says
It would be unfair to say, as Paul Krugman famously said of this school, that they "mistook beauty for truth".
He went to libraries to study designs and put together the rocking chair that an employee mistook for a stroller.
David Mirambeau, 29, was making a delivery for United Parcel Service Inc. when he mistook the gunshot for a blown tire.
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When I agreed with him that we needed a change at the top, he mistook this for my being in his pocket.
Pistorius denies murder in the Valentine's Day killing of model Steenkamp, saying he mistook her for a nighttime intruder in his home.
He denies murdering the 29-year-old, saying he mistook her for an intruder.
Oscar Pistorius admits shooting Reeva Steenkamp at his home on Valentine's Day but denies murder, saying he mistook her for an intruder.
BBC: Oscar Pistorius brother Carl also facing homicide trial
He claims he mistook her for an intruder when he shot her through a locked door in a bathroom in his home.
Pistorius says he mistook her for an intruder and shot her accidentally.
At other times, too, the pad mistook left clicks for right ones.
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The first officer saw a bright object ahead of the plane -- the planet Venus -- and mistook it for the approaching C-17.
In 1993, when I took a trip to Italy, people mistook me for Japanese, as there were very few Chinese traveling overseas then.
Oscar Pistorius, meanwhile, is charged with premeditated murder in the shooting he says was accidental because he mistook model Reeva Steenkamp for a burglar.
His case closely mirrors that of Pistorius, who fatally shot his girlfriend, Reeva Steenkamp, on Valentine's Day, saying he mistook her for an intruder.
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